带暗支撑短肢剪力墙结构振动台试验研究

提出了钢筋混凝土带暗支撑短肢剪力墙结构体系。进行了1个1/6缩尺的带暗支撑短肢剪力墙结构模型与1个1/6缩尺的普通短肢剪力墙结构模型模拟地震振动台试验研究。通过试验,分析了两个模型在弹性、开裂、破坏各阶段的动力特性及动力反应,比较了两个结构模型的破坏形态。试验结果表明:在弹性阶段,两结构的动力特性及动力反应相近;在混凝土开裂后的弹塑性阶段,带暗支撑短肢剪力墙结构与普通短肢剪力墙结构相比,其抗震能力显著提高,层间位移及结构顶点位移峰值显著减小;带暗支撑短肢剪力墙结构墙肢底部塑性铰区域比普通短肢剪力墙结构塑性铰区域显著增大,抗震耗能能力显著提高。建立了结构弹性和弹塑性有限元时程分析力学模型,进行了结构的时程动力计算分析,计算结果与试验结果符合较好。

Earthquake simulation test on short pier RC shear wall structure with concealed bracings

Short pier RC shear wall structure system with concealed bracings was put forward.Two 1/6 scale models of short pier RC shear wall structure with and without concealed bracings were tested on the shaking table.Dynamic character and dynamic response of the two structures were respectively studied at elastic,cracking and failure stage through the experiment.The comparison of failure mode between the two structures was also made during different stages.The test results indicate that the dynamic character and dynamic response of the two structures are similar during elastic stage.During the plastic stage,the resistance of the short pier RC shear wall structure with concealed bracings is much better than that of common short pier shear wall structure without concealed bracings.The interstory drift of each floor and the roof drift of the former are much smaller than those of the latter.The crack distribution height of the wall with concealed bracings is much higher than that of the wall without concealed bracings,so the ability of dissipating energy of the former is much better than that of the latter.Finite element time-history analysis is made at the stages of elasticity and nonlinear.The calculated results agree well with the experiment results.